Silencer for internal-combustion engines



' v w. HL JNTER ET AL I SILENCER FOR INTERNAL COMBUSTION ENGINES Filed March 6. 1920 Patented Augr19, 1924.

UNITED "STATES" PATENT OFFICE.

HUNTER AND MAY GILL, F BLACKPOOL, ENGLAKD. SILENCER FOB INTERNAL-COMBUSTION ENGINES.

a lication and limb a, mo. Serial 1%. season.

4 To all whom it may concern;

Be it known that we, WILLIAM HUNTER and (Miss) MAY GILL, subjects of the King of ..Great Britain, and both residing in Blac ments in silencers for internal combustion engines, and generall to arrangements adapted to be connect with the exhaust of an. internal combustion engine.

The objectof the invention is to provide an arrangement which is capable of absorbing the energy of the gases and further to provide an arrangement which assists in re- .moving the last portions of the exhaust,

gases. The invention will be described with reference to the accompan ing drawing and the scope will be indicate in the appended claims. The single drawing represents a longitudinal section through one form of the improved silencer.

In the drawing, -1 is a cylindrical member )rovided at one end with a fiange 2, which isjbolted to a flange 3 carried by a conical member 4 havin a tubular portion 5 within which is screwed a tubular member 6 leading to the exhaust manifold.

At the other end, the cylinder is provided with a flange Z which is bolted to a flange 8 on a conical member-9 rovided with a tubular member 10 exten ing within and without the narrow end of the cone. The

outer portion of this tubular member 11 is internally threaded to receive a dischar e pipe 10. The internal portionof the tu 11 is internally threaded to receive a tube 12 which is externally threaded to receive an annular member 13 provided with arms 14 carrying a tubular member 16. Into this tubular member at one-end there is threaded a tube'provided .with an ejector nozzle 15 at one end, and into the other end is threaded a tube 17 extending throughout the length of the cylinder and carrying a spiral vane 18. This spiral is arranged so as to act as a bafiling member for the gases and it will be seen that the outer part of the spiral is close to the inner wall of the cylin-' to allow of the expansion of the gases as thelaye pass through the device.

tween the flanges 2 and 3 there is also secured a flexible diaphragm 19 which is centrally perforated at 20 for example so that the perforation is of the same size as one exhaust valve, not shown. The open end of the tubular member 17 is located centrally opposite the perforation 20.

In operation the gases enter at 6 and impart a portion of their energy to the resilient member placed in their path which in the referred embodiment shbwn in the drawing consists of the centrallyperforated flexible diaphragm 19. After passing the resilient member, the gases are baffled by baflling means, which as shown in the drawing consist of a spiral vane mounted one. central support in such manner that the .cross sectional area of the passage gradually increases. An ejector is preferably. rtion of provided in such manner that a the gases enters the inlet end of the ejec tor, which is shown as placed immediatelyopposite and sub uent to the central perforation 20 of the diaphragm 19, whereupon a portion of the gases passes through the ejector and creates a suction on leaving the nozzle 15, thus assisting in the removal of the exhaust gases.

We claim as our invention 1. In a silencer for internal combustion engines, a cylindrical tube and a circularresillent centrally perforated diaphragm whose outer edge is attached to the wa l of the tube and whose inner edge is free to vibrate in a direction atright angles to the plane of said diaphra 2. In a si encer for internal combustion engines, the combination of a cylinder and a resilient perforated diaphragm therein with an ejector tube concentric with said diaphragm and so arranged that part of the gas passes through the e ector and part passes around the ejector.

3. A silencer for internal combustion engines comprising a cylindrical tube partially closed by a resilient diaphragm having a 4. A silencer for internal combustion engines com risin a plylindrical tube, a centrally per ora res lent diaphragm therein, a central ejector tube opposite said perforation, and spiral vanes mounted on said cfintral tube to provide a spiral passage for I; e

5. A silencer'for internal combustion engines comprising a cylinder, a centrally perforated resilient dia hragm therein, an ejector tube coaxial wit said cylinder and opposite said perforation, and spiral vanes situate between said tube and the inner wall of said cylinder to provide a baflling passage tric with said cylinder and adapted to form an uninterrupted passa for the exhaust gas, an ejector connec to said tube and a continuous uninterrupted spiral baflle extending between the outer wall of said tube and the inner wall of said cylinder in order that the gas sucked through the spiral by the ejeclior W111 move in a smooth uninterrupted p In witness whereof, we have hereunto signed our names this 5th day of February 1920, in the presence of two subscribing witnesses.

WILLIAM HUNTER. MAY GILL. Witnesses Harem E. Po'rrs, J orm MCLACHLAN. 

